Environmental Protection Grades of Office Chairs

The environmental protection grades of office chairs primarily involve formaldehyde emission standards and limits on related harmful substances, with the core basis being the grade classification and harmful substance control specified in national standards.

I. Formaldehyde Emission Grade Standards

The formaldehyde emission from the panels used in office chairs must comply with the grade classifications specified in national standards, with common grades including E1 and E0:

• E1 Grade: This is a mandatory standard, with formaldehyde emissions ≤0.124mg/m³ (climate chamber method) or ≤1.5mg/l (desiccator method). This grade represents the minimum environmental protection requirement for office furniture. Office chairs meeting this standard can be used normally, but their formaldehyde emissions are relatively high.
• E0 Grade: This grade has stricter requirements, with formaldehyde emissions ≤0.050mg/m³ (climate chamber method) or ≤0.5mg/l (desiccator method). Choosing E0-grade office chairs can significantly reduce the risk of indoor formaldehyde pollution, making them particularly suitable for places with high air quality requirements.

The GB 18584—2024 Limits of Harmful Substances in Furniture, which will come into effect on July 1, 2025, further optimizes testing methods by introducing non-destructive testing techniques and adding limits for total volatile organic compounds (TVOC), requiring TVOC emissions ≤0.30mg/m²·h (72h). This update makes environmental protection standards more comprehensive, covering more potential sources of pollution.

II. Limits on Other Harmful Substances

In addition to formaldehyde, office chairs must also meet the following detection indicators for harmful substances:

• Migratable Heavy Metals: Such as lead, cadmium, and mercury, whose contents must comply with standard limits to prevent harm to human health through contact or inhalation.
• Phthalates: Commonly used as plasticizers, excessive use of which may interfere with the endocrine system, with strict limits on their content specified in standards.
• Polycyclic Aromatic Hydrocarbons: A class of carcinogens primarily derived from materials such as rubber and coatings, with standards requiring their content not to exceed specified limits.
• Decomposable Aromatic Amine Dyes: Used in textile dyeing and potentially carcinogenic, with standards prohibiting the use of such dyes or limiting their residual amounts.

The control of these indicators ensures the environmental friendliness of office chairs in terms of material selection and production processes, reducing the release of harmful substances from the source.